build(capacitor): ⬆️ upgrade for capacitor v5

[eljass]

Description

• Adds support for Capacitor v5
• Fixes updateUnreadCount notification object is nil #31

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[mrozema]

Is this PR ready to be merged? I was hoping to use your fork of capacitor-intercom because the capacitor-community version is basically unmaintained, but this v5 update is critical to get updated. Thanks!

[eljass]

@mrozema sorry to get back to you so late. We haven't yet updated into v5, but will do so in next week and upgrade this plugin as well.